Diffusion of free trions in mixed-type GaAs/AlAs quantum wells

Howard W. Yoon, M. D. Sturge, Arza Ron, L. N. Pfeiffer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We show that an emission line which depends on the simultaneous presence of excitons and < 2 × 1010 cm-2 electrons in a 20 nm GaAs quantum well is due to free negatively charged excitons or 'trions'. Using time- and spatially-resolved photoluminescence, we find that trions and excitons are localized at 5 K, and with increasing bath temperature both species become mobile. The diffusivity of trions and excitons increases linearly with bath temperature, and the trion mobility is found to be about one-half the exciton mobility.

Original languageEnglish (US)
Pages (from-to)302-304
Number of pages3
JournalJournal of Luminescence
StatePublished - Jun 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • General Chemistry
  • Biochemistry
  • Condensed Matter Physics


  • Diffusion
  • Quantum wells
  • Trions


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